Wavenumber spectra of horizontal wind and temperature measured with WINDII, Part I: observational results

Details Wavenumber spectra of horizontal wind and temperature measured with WINDII, Part I: observational results Wavenumber spectra of horizontal wind and temperature measured with WINDII, Part I: observational results

Jul 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000jastp..62..967w&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 62, Issue 11, p. 967-979.

Physics

3

Scientific paper

The horizontal wind and temperature data inferred from the WINDII green line observations are used to derive global maps of vertical and horizontal wavenumber spectra, and to investigate the temporal//geographic variations of atmospheric wave motions. The planetary-scale disturbances between 90 and 120 km in September /1995 were found to be characterized by large r.m.s. velocities of /~30-45 m//s and fractional temperatures of /~5-9%, with maximum velocity variances in the region over the equatorial Indian - Central Pacific Oceans. In contrast, the small-scale gravity waves displayed mean fluctuation amplitudes of /~18-30 m//s and 3-6%, with the maxima at mid-latitudes. The velocity variances of both scales slowly increased with increasing altitude at the lower heights, with a faster growth for the large-scale waves, but remained virtually constant above ~105km due to the wave breaking and saturation. The results also revealed strong correlations between the longitudinal and temporal variations of the large- and small-scale waves. Vertical and horizontal wavenumber spectra observed at different locations and times showed great similarities, respectively, confirming the notion of ``universality''. However, significant temporal//geographic variations were found to exist, in respose to the changes in the wave source mechanisms and//or the interaction of gravity waves with, and their filtering by, the variable environment.

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